제출 #1223306

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1223306		hengliao	Colors (BOI20_colors)	C++20	0 / 100	0 ms	436 KiB

Colors

#include<bits/stdc++.h>
using namespace std;

#define F first
#define S second
#define pll pair<ll, ll>
#define vll vector<ll>
#define pb push_back

typedef long long ll;

const ll inf=1e18;

ll qry(ll tar){
    cout<<"? "<<tar<<endl;
    ll re;
    cin>>re;
    return re;
}

void solve(){
    ll n;
    cin>>n;
    ll x=0;
    ll pos=1;   
    ll lef=1, rig=n-1;
    ll mx=-inf, mn=inf;
    while(lef<=rig){
        ll mid=(lef+rig)/2;
        x+=pos*mid;
        mx=max(mx, x);
        mn=min(mn, x);
        pos*=-1;
        lef=mid+1;
    }   
    // cout<<mn<<' '<<mx<<endl;
    ll cur=1-mn;
    lef=1;
    rig=n-1;
    ll good=-1;
    qry(cur);
    pos=1;
    while(lef<=rig){
        ll mid=(lef+rig)/2;
        cur+=pos*mid;
        pos*=-1;
        if(qry(cur)){
            good=mid;
            rig=mid-1;
        }
        else{
            lef=mid+1;
        }
    }
    if(good==-1) cout<<"= "<<n<<endl;
    else cout<<"= "<<good<<endl;
}

int main(){
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);

  solve();

  return 0;
}

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